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Bug #9818

garbage pixels on ILCE-7{,R} raws

Added by Mattia Dongili about 6 years ago. Updated about 6 years ago.

Status:
Fixed
Priority:
Low
Assignee:
-
Category:
Darkroom
Start date:
02/16/2014
Due date:
% Done:

100%

Estimated time:
Affected Version:
1.4.1
System:
other GNU/Linux
bitness:
64-bit
hardware architecture:
amd64/x86

Description

simlar to: http://darktable.org/redmine/issues/9010

and similarly, cropping 26 pixels in ILCE-7 profile gets rid the issue.
<Crop x="0" y="0" width="-26" height="0"/>
What is not yet clear to me is why Darktable doesn't generate/export 6000x4000 images.

Camera pics:
http://taihen.jp/photo/DSC00263.ARW
http://taihen.jp/photo/DSC00263.JPG

attached a screenshot that demonstrates the garbage pixels.

PS: this is on Debian but it's anyway not architecture or build specific.
PS1: ILCE-7R has the same issue, you can find sample images online i.e. here: http://www.imaging-resource.com/camera-reviews/sony/a7r/YDSC00038.ARW.HTM

shot-2014-02-16_11-08-13.jpg (25.7 KB) shot-2014-02-16_11-08-13.jpg Mattia Dongili, 02/16/2014 04:36 AM

History

#1 Updated by Pascal de Bruijn about 6 years ago

  • % Done changed from 0 to 100
  • Target version set to Candidate for next patch release
  • Status changed from New to Fixed

Thanks for reporting and the samples!

The required changes have been committed (to both git master and the darktable-1.4.x branch):

https://github.com/darktable-org/darktable/commit/d9577e4157705012bc64d80279e4f2ced2cd0238

As a sidenote with regard to the resolution, camera sensors have more pixels than the camera outputs, this is for one reason used for simplistic demosaicing algorithms to avoid having to deal with literal edge cases. Both open source RAW reading libraries (RawSpeed and LibRaw (which is dcraw derived)) can deal with this just fine, thus you get a few more pixels. Some people would do a fight to the death for these few extra pixels, some don't like this. Sadly sticking to the exact vendor resolution isn't always a win either, since many camera's firmwares produce slightly off aspect ratio's as well, so there's no universal right answer to this issue.

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